Filling-piece for railway-frogs



(No Model.)

T. A. GRIFFIN.

FILLING PIECE FOR RAILWAY FROGS.

UNITED STATES PATENT OFFICE.

THOMAS A. GRIFFIN, OF CHICAGO, ILLINOIS.

FILLING-PIECE FOR RAILWAY-FROGS.

SPECIFICATION forming part Of Letters Patent NO. 380,031, dated March27, 1888.

Application filed November 28, 1887. Serial No. 256.304. (No model.)

.T 0 all whom t may concern:

Be it known that I, THOMAS A. GRIFFIN, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Filling-Pieces for Railway- Frogs, of which the following is aspecification.

My invention has for its object the production of a frog-filling whichshall be at once strong, light, and cheap, and so close fitting as togive adequate support to every part of the frog, and, further, toeconomically dispose the metal.

My invention consists in the parts and combinations hereinafterdescribed and claimed.

In the drawings, Figure l is a plan view of a frog. Fig. 2 is across-section on line .fc zr, Fig. 1 and Fig. 3 is a cross-section online yy, Fig. 1. Fig. 4 is a perspective view of one piece offrog-filling.

A and B, Fig. l, are the frog-filling pieces. C and D are the railsforming the point of the frog, and EF are the wing-rails.

By an inspection of Fig. 1 it will be seen that in order to procuresupport for the tapering points of rails C and D said rails are bentsidewise and their heads planed on their edges, so as to bring theirwebs directly under the head of the rails at their points. The bendingof the rails C and D makes the space between them and the wing-rails E Fvarying, so that a straight filling of uniform width will not fitaccurately. To produce the required shape in wrought metal is tediousand expensive, while a cast-iron filling is liable to breakage. Forthese reasons I employ malleable iron as the material fr making thefilling, and in order to provide a maximum of strength with a minimum ofmaterial I employ the shape shown in Figs. 2, 3, and 4.

By reference to these figures it will be seen that between thebolt-holes bb are formed hollows c c on the sides and c on the bottom ofthe filling, the diminution of sectional area corresponding withinpractical working limits to the diminution of area caused by theboltholes, so that a cross-section taken between the bolt-holes wouldhave about the same area as one taken through the adjacent bolt-holes.(Vide Figs. 2 and 3.)

Instead of using a solid filling-piece varying in section, myfilling-piece is lightened as much between the bolt-holes by theformation of hollows upon -the exterior as it is lightened by and at thebolt-holes.

One result of this uniformity of section is that the malleating processtakes effect uniformly throughout and is accomplished in less time. Theprojections a a', which are shown somewhat exaggerated in Fig. 4, fillin the vacancies caused by the termination of the webs of rails C and D.

I claiIn.-

In a railway-frog, the filling-piece of cast metal, in which are formedthe bolt-holes b b, and the hollows c c between the bolt-holes forpreserving a uniform section, as described.

THOMAS A. GRIFFIN.

Witnesses:

P. H. T. MASON, J. I. VERDER.

